Casing-ripping device



April z8, 1925. l r1,535,234

' W. B. MCMURTIE ET AL CASING RIPPING DEVICE Eum/ f attain,

April 28, 1925.

W. E. MCMURTIE ET Al..

GASING RIPPING DEVICE Filed June 24, Y1924 2 Sheets-Sheet 2 S11/vanto@ 27 wir m p u .9U

atto: nu,

Patented apr. 28, 1925.

UNITED STATES WILLIAM B. MGMURT'IE AND JOHN W. MOORE, 0F SHIDLER, OKLAHOMA.

cAsrNG-BIPPING DEVICE.

Application aied June 24, 1924. serial No. 722,089.

To all wltomjt-may concern:

Beit known that we, WILLIAM B. MCMUR- 'rn-z and JOHN lV. Moonn, `citizens of the United States, residing at Shidler, in the county of OsageA and State of Oklahoma,

have invented certain new and useful Im- -provcments in a Casing-Ripping Device, of

which the following is a specification.

rlhis invention relates to new andl useful improvements in means for ripping casings in oil wells whereby the same may be salvaged in a more eflicient and simple manner.

One of the important objects of the present invention is to provide a casing ripping device ofy the above mentioned character, which may be readily and easily placed in position for ripping the outer casing of a pair of concentrically.arranged pipes orcasings, means being vprovided for moving the ripping knife to an operative position automatically upon the vertical sliding movement ofthe body member which supports the knife.

A still further object of the invention is f to provide a casing rippingdevice of the above mentioned character, whlch 1s slmple in construction, inexpensive, strong and durable and furthermore adapted for the purposes for which it is designated.

Other objects and advantages of this invention Will become apparent" during the course of the following description.

In the accompanying drawings forming a part of this specification .and in which like numerals designate like parts 'throughout the same: i

' Figure 1 is a sectional viewthrough the device showing the same in positioi within the outer casing with the ripping knife in an inoperativeA position Fig. 2 is a similar view showing the rip?. ping knife in an operative position;

Fig. 3 is a side elevation of the casing ripping device showing the guide means for the ripping device; n

Fig; 4vis a sectional view taken approximately on line L1-4 of Fig. 1;

Fig. 5 is-a similar section taken approximately on line 5-5 of Fig. 1; and

Fig. 6 is a vertical'seetional view taken approximately on'lineG--G of Fig.'3.

In the drawings wherein for the purpose of illustration is shown the preferred embodiment of our invention the numerals 1 and 2 designate inner and .outer casings or j pipes which are Ordinarily embedded in the ground, the outervcasing 1 forming a pro- 'means whereby the outer casing 1 may be salvaged and to this end we provide a ripping device designated generally by the numeral 3 in the drawing with reference more particularly tozFigure 3.

The ripping device comprises a cylindrical body portion 4 which is provided with an eccentric bore 5, the purpose of which is to `provide a means whereby the cylindrical body may extend into the outer casing 1 and around the inner casing 2 in the manner clearly illustrated. in Figures 1 and 2 of the drawings. The upper end of the cylindrical body portion 4 is provided with a reduced extension 6 which terminates in the threaded tapered end 7 for receiving an operating tool of any well known construction for facilitating in the operation of the casing ripping device.

The lower portion of the cylindrical body 4 is provided with a vertically extending groove or channel 8 and the same communi- Cates with a suitable opening 9 provided in 'the bottom of the cylindrical body portion 4, the purpose of which will hereinafter be more fully described. The portion of the cylindrical body 4 adjacent the vertical channel or groove 8 are cut away as-illustrated at 10 on each side of the channel and 12 respectively are provided, the same being further provided with longitudinally i extending guide slots'13. The guide slots are inclined downwardly to cooperate with the cut away portions l0 and whereby the back portion of the vertical channel 8 forms a wedge in the manner as illustrated at 14 in the drawings.

- Adapted for vertical sliding movement in the channel 8 is the ripper knife l5 and the same'is provided with the lateral projection 16 which cooperates with the downwardly inclined guide slot 13 for supporting the ripper knife in proper position.

Associated with the cylindrical body 4 is the frictional member designated generally byv the numeral 17 and the same comprises a substantially rectangular shaped frame which is arcuate in cross section in the manner clearly illustrated in Figure4 of the hereinafter be more fully described.

drawings. llxtending through the trame are the Hat springs 1S and 1t) respectively, the lower-'ends of which are secured to the lower portion 20 of the frame by means of fastening bolts 21. The upper ends of the spring elements 1S and -19 are adjustably secured together by means'of the bolt 22 and the nuts 23 associated therewith, the same extending through the upper cross piece 24 of the frame. There are a pair ot each ot these spring elements supported in the frame 17 on each sidelof the central partition 25 in the manner clearly illustrated in Figure 3 of the drawings.

The purpose of the spring'elements is to provide a means 'for engagement with the inner and outer casing for frictionally slipporting the member 17 in position between the casings and the purpose thereof will also A The upper and lower cross bars ot the frictional member 17 are provided with centrally arranged re; 'istering openings which openings are further adapted to register with the opening 9 provided in the bottom of the cylindrical member fl. It is of course to be understood that the frietional member 17 is disposed below the cylindrical member in the manner more clearly illustrated-in Fibelures l, 2 and 3 of the drawings. Extending longitudinally through the frictional member 17 through the opening provided therein and also through the opening 9 in the lower portion of the cylindrical member 4 is the stem 26.

'lhe stem isof a suitable length'andhas supported on the lower end thereof the nut 27 which is adapted for engagement with the lower cross bar 20 of the frame 17 while the upper end of the steml has secured thereto the ripper knife engaging head 28. Theintermediate portion of the stem 26'has a recess 29 provided in the outer side thercot and pivotally supported therein at 30 at its upper end 'is-the trip 3l. A coil spring 32 is associated with the ,trip 31 and the rear wall of the recess for normally holding the trip lever in an operative position in the manner more clearly illustra-ted in Figure 2 of the drawing.

'lhe operation ot our improved casingde-f vice may be brietly stated as follows-The cylindrical member -1 and the friction-al member 17 are inserted into thel casing l so that the inner casing 2 will be received in the eccentric bore. 5. 'lhe parts are placed in the casing 1 'in such a manner asto be disposed in' a position as shown in Figure 1 of the drawings. With the parts arranged as shownin Figure 1, the springs 18 and v19 will hold .the frictional member in engagement with the outer and inner casing respec- Atively and will be prevented from moving vvith the cylindrical body portion 4. The ripper knife 15 will be disposed in its lowervupmu'dly and relative' to the cylimlrical body, and along the slot 13 and wedge portion 14, whereby it 1s`iorced into cutting position.

vly ripping the outery casing 1, the same may be salvaged more easily and efliciently and will also save considerable time in extracting the section of the outer casing. The simplicity of our device enables the same to he readily and easily placed in an operative position and will furthermore be positive in its operation. Furthermore, a casing ripping device of the above mentioned character. may be. manufactured at a very low cost and will be strong and durable.

While we have shown the preferred embodiment of our invention it is to be undertood that various changes 1n the size, shape and arrangement of parts may be resorted to Without departing from the spirit ofthe invention and the scope of the appended claims.

Having thus described described the inprovided with an exterior vertically inclined opening, a knife having a projection slidablyvlocated inthe opening, and means for moving the knife with relation to the body.

2. In a ripping device, a. cylindrical body having a longitudinally extending eccentrically disposed bore so as to provide ay com- .paratively thick side and a coniparativelythin side, a stem extending from the end ot the comparatively thick side of the body.v said comparatively thick side of' the body provided with an extcriorly disposed longitudinally extending recesshaving its innml wall inclined so that the depth ofsaid recess is'less at its top than,.at its bottom. the side Walls of said recess being provided with slots extending parallel with eachother and with the inclined inner wall, a knife slidablc alor" the inclined inner wall of the recess and provlded with projections slidable in the litt) lltl n1,535,234 l a slots, and means for moving the knife with relation to the body, said means including a trip carried by thel body and' connected with the knife. i

3. In a ripping device, a` cylindrical body having a longitudinally extending eccentri callydsposed bore so as to providea comparatively thick side and acomparatively tliin side, a stem extending from the end of 10 the comparatively thick side of the body, said comparatively thick side ofthe body provided with an eXt/eriorly disposed longitudinally extending recess having its inner Wall inclined so that the depth of said recess is less at its top than at its bottom, the side walls of said recess being provided With slots extending parallel with each other and with the inclined inner Wall, a knife slidable along the inclined inner wall of the recess and provided vvith projections slidable in the slots,`means for moving the knife' with relation to the body,said means including a stem connected with the knife and extending.

along the body beyond the bottom end thereof,' a friction member slidable on the stem, a trip pivoted to an intermediate portion of the stem, and a spring associated with the trip to hold it extended outwardly from 4the stem, said trip adapted to engage the upper end of the friction member when disposed at-the bottom of the stem.

In testimony whereof We affix our signatures. y

WILLIAM BMQMURTIE; J. W. MooRE. 

